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  1. class Test {
  2. 	public static void main(String[] args) {
  3.  
  4. 		int k = 10000;
  5. 		long st, en;
  6. 		int[] A;
  7. 		int length = 100000;
  8.  
  9. 		A = new int[length];
  10. 		st = System.nanoTime();
  11. 		for (int i = 0; i < length; i++)
  12. 		{
  13. 			A[i] = k;
  14. 		}
  15. 		en = System.nanoTime();
  16. 		System.out.println("\nOne time=" + (en - st) / 1000000.d + " msc");
  17.  
  18. 		int cache = 10000;
  19. 		A = new int[length];
  20. 		int[] temp = new int[cache];
  21. 		st = System.nanoTime();
  22. 		for (int N = 0; N < length; N+=cache) {
  23. 			for (int i = 0; i < cache; i++)
  24. 			{
  25. 				temp[i] = k;
  26. 			}
  27. 			System.arraycopy(temp, 0, A, N, temp.length);
  28. 		}
  29. 		en = System.nanoTime();
  30. 		System.out.println("\nTwo time=" + (en - st) / 1000000.d + " msc");
  31.  
  32. 	}
  33. }
Success #stdin #stdout 0.1s 320576KB
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One time=1.958895 msc

Two time=0.175011 msc
https://ideone.com/Py6A4S
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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